5 #include "../arch/arch.h"
7 #define FRAND32_MAX (-1U)
8 #define FRAND64_MAX (-1ULL)
11 unsigned int s1, s2, s3;
14 struct taus258_state {
15 uint64_t s1, s2, s3, s4, s5;
21 struct taus88_state state32;
22 struct taus258_state state64;
26 struct frand64_state {
27 uint64_t s1, s2, s3, s4, s5;
30 static inline uint64_t rand_max(struct frand_state *state)
38 static inline void __frand32_copy(struct taus88_state *dst,
39 struct taus88_state *src)
46 static inline void __frand64_copy(struct taus258_state *dst,
47 struct taus258_state *src)
56 static inline void frand_copy(struct frand_state *dst, struct frand_state *src)
59 __frand64_copy(&dst->state64, &src->state64);
61 __frand32_copy(&dst->state32, &src->state32);
63 dst->use64 = src->use64;
66 static inline unsigned int __rand32(struct taus88_state *state)
68 #define TAUSWORTHE(s,a,b,c,d) ((s&c)<<d) ^ (((s <<a) ^ s)>>b)
70 state->s1 = TAUSWORTHE(state->s1, 13, 19, 4294967294UL, 12);
71 state->s2 = TAUSWORTHE(state->s2, 2, 25, 4294967288UL, 4);
72 state->s3 = TAUSWORTHE(state->s3, 3, 11, 4294967280UL, 17);
74 return (state->s1 ^ state->s2 ^ state->s3);
77 static inline uint64_t __rand64(struct taus258_state *state)
81 xval = ((state->s1 << 1) ^ state->s1) >> 53;
82 state->s1 = ((state->s1 & 18446744073709551614ULL) << 10) ^ xval;
84 xval = ((state->s2 << 24) ^ state->s2) >> 50;
85 state->s2 = ((state->s2 & 18446744073709551104ULL) << 5) ^ xval;
87 xval = ((state->s3 << 3) ^ state->s3) >> 23;
88 state->s3 = ((state->s3 & 18446744073709547520ULL) << 29) ^ xval;
90 xval = ((state->s4 << 5) ^ state->s4) >> 24;
91 state->s4 = ((state->s4 & 18446744073709420544ULL) << 23) ^ xval;
93 xval = ((state->s5 << 3) ^ state->s5) >> 33;
94 state->s5 = ((state->s5 & 18446744073701163008ULL) << 8) ^ xval;
96 return (state->s1 ^ state->s2 ^ state->s3 ^ state->s4 ^ state->s5);
99 static inline uint64_t __rand(struct frand_state *state)
102 return __rand64(&state->state64);
104 return __rand32(&state->state32);
107 static inline double __rand_0_1(struct frand_state *state)
110 uint64_t val = __rand64(&state->state64);
112 return (val + 1.0) / (FRAND64_MAX + 1.0);
114 uint32_t val = __rand32(&state->state32);
116 return (val + 1.0) / (FRAND32_MAX + 1.0);
121 * Generate a random value between 'start' and 'end', both inclusive
123 static inline int rand_between(struct frand_state *state, int start, int end)
128 return start + (int) ((double)end * (r / (rand_max(state) + 1.0)));
131 extern void init_rand(struct frand_state *, int);
132 extern void init_rand_seed(struct frand_state *, unsigned int seed, int);
133 extern void __fill_random_buf(void *buf, unsigned int len, unsigned long seed);
134 extern unsigned long fill_random_buf(struct frand_state *, void *buf, unsigned int len);
135 extern void __fill_random_buf_percentage(unsigned long, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);
136 extern unsigned long fill_random_buf_percentage(struct frand_state *, void *, unsigned int, unsigned int, unsigned int, char *, unsigned int);